Typewriting machine



w. A. SCHMIDT TYPEWRITING'MACHINE INVENTOR ATTORNEY Filed June 15, 1925 WITNESSES MM Patented Jan. 1, 1929.

UNITED srnrss re'rssr OFFICE.

WILEELM A. SGHM'IIDH, 0F ILION, NEW YORK, ASSIGNQR TO ItEMINGTONfTYTBEWEiTER COMPANY, OF ILION, NEW YORK, A CQRPORATION 0F 5503K.

- TYPEW'LRIITING MACHINE.

Application filedJune 15, 1925. Serial No. 31,085.

My invention relates to means for locking screws, and especially pivot screws, ol' typewriting machines so as to secure them against displacement, and the object of the invention, generally, is to provide new and improved locking means which may be applied to a screw without disturbing its adjusted position. I

More specifically the object of the invention is to provide locking devices for the pivot screws on which the spacing or feed rack of the machine swings. In prior constructions .these .privotscrew-s have usually been locked in place by nuts, which method has been objectionable for the reasons that the nuts .are sometimes not properly tightened and it is q ui'te clifiiciilt to get at them with wrench to tighten them, and further thattheactof tightening the nutis apt to atvfeet the screw, displacing it slightly and thus throwing itvont of adjustment. The present impronement comprises the preferred form, a flanged locking plate which is readily applied ,to the exposed or projecting portion oi the pivot screw soas to press it on itssupport in a direction transversely of the screw axis, thus locking the screw in place Without disturbing its on dwise position.

To the above and other ends which will hereinafter appear, my invention consists in the features of construction, combinations of devices, and arrangements of parts hereinafter described and particularly ,pointed out thereon together with any improvements .ap-

plied to the pivots thereof.

Figure 2 is .a tronteto-rear verticalsectiona1 view taken one gplaneindicated hythe section line22 in Fig. 1 and looking in the direction of the arrows at sa d line.

Figure 3 Asia vertical sectional view on an enlarged scale when on a plane indicated "by .tllGGQCtlOH line3-3 .:in Figure 1, and docking in the direction ofthe errowsat said line.

Figure 4 is run enlarged vertical sectional view taken on a plane indicated by the section line in Fig. 2 and looking forward in the direction of the arrows atjsaid line.

Figure 5 is a perspective view of one of the improved locking plates. i I

As apgpezrrs irom l and'Q, the carriage of the machine comprises a rectangular frame composed of front and rear hars, only the rear bar lbeing shown, said bars being connected by end bars '2 and Supported on the carriage is a rotary platen t. he front and rear bars are grooved to co -operate ,with anti-friction rollers 5 which run on cor-respondingly grooved rails or tra'ckways {fixedly supported above the top plate \orfr'ame 6, only the rear rail '7 being shown herein. Se-

cured to the end portions of the rear barl by screws 8 are bearing plates '9 having upturned end portions 10 formed with hearing open,- ings which receive the outwardly projecting plain pivot portions llof pivot screws 12, the reduced ends 11 tonining shoulders with the threaded lbody portions .12. The inner ends of the screws are formed with nicks or slots 14- to receivea screw driver or other-tool whereby the ,pivot screws may be conveniently threaded into talpll d openings formed in the lugs or forwordlyie tending parts 15 of a feed rack supportin bar or frame 16, said frame further comp end portions or lugs 17 termed \with tapped openings .to receive the headed securingscrews 18 whereby the feed rack '19 is secured to itsswinging supporting frame. It will he nnderstoodthat the frame, comprising the bar-like ,portion 16 with ,the forwe 'Clly projecting parts or lugs 15 and theend lugs 17,, is .an integral member 0.1" casting to which thespaciug .or feed rack 19 is detachahly secured by the screws IS. The rack .19 normally meshes with a feed pinion 20 which is connected with the usual escapement wheel, not shown, the rack being adapted to be swung upward on its "pivotal supports to disengage drom .the pinion 20, as shown by dotted lines in Fig. 3, and there- ;by tree the carriage (from sthe control ofthe not bind with their shouldered portions against the inner vertical faces of said bearings, they will at the same time not be adjusted inward towards each other so far as to permit undue separation from the parts 10, which would result in looseness of the supporting frame 15-17 and the rack 19. Heretofore, in order to maintain the screws 12 set or locked in their supporting parts 15 after adjustment, it has been customary to employ check nuts which have been threaded onto the inner portions of the screws that project outside of the bearing lugs This method of setting the screws has however been open to various object-ions. In the first place, the screws are not easy of access, and if the check nuts are. not properly tightened or should work loose it is inconvenient to get at them with a wrench. Moreover, the very act of tightening the screws is apt to displace to a greater or less extent the screw itself, thus disturbing the adjustment. In order to overcome these defects, I have dispensed with the locking nuts and have provided instead a simple locking means which maybe applied readily and without disturbing the adjustments. In the present instance, the means for .each screw com-prises a locking device or plate designated as a whole by the numeral 21 and shown detached in Fig. 5. The plate has its side portions bent at right angles to the body portion, providing ribs or flanges 22, the rear ends whereof, designated as 23, project slightly beyond the body port-ion and have their lower corners beveled off to provide contact faces 24:. Betweenits end portions the body of the plate is formed with a hole or opening 25, the upper portion of which is enlarged or beveled as indicated at 25. The locking device or plate is arranged so as loosely to embrace the associate lug 15 between its flanges and so that the contact faces 2% may contact with the threaded portions of the associate screw projecting oppositely outward from the sides of the bearing part or lug 15, as will be clearly apparent from a consideration of Figs. 1, 8 and 4. The rear end portion of the locking plate rests on the bar 16, the ends or corners of the flanges 22 contacting with the top face of said bar to fulcrum thereon. The hole 25 receives a securing screw 26 which is threaded downward into the bar 16. The screw 26 has a head 27 larger than the hole, the under face of said head being coned as indicated at 28 to co-operate with the beveled portion 25 of the hole. By tightening the screw 26 the locking plate is forced downward and the pressure is transmitted from the screw 26 through the locking plate and its contact faces 24 with a leverage-like action to the pivot or screw 12, transversely of the longitudinal axis thereof. The pivot or screw 12 thus receives a transverse pressure applied equally to its oppositely projecting portions,

this preventing unequal binding of the screw but forcing it evenly against the opposite side of the tapped hole into which it is threaded, so that the screw or pivot is locked or set on its supporting part without having its adjustment disturbed. The securing screws 2628 are readily accessible from the top of the machine enabling the locking devices to be easily applied and removed. The invention as shown herein is quite simple and economical and yet enables extremely effective and satisfactory'results to be obtained. Of course the locking plates or other devices embodying the principles of my invention may be applied to screws, pivots or devices other than the feed-rack pivot-screws exemplified herein, for locking or securing purposes.

' hat I claim as new and desire to secure by Letters Patent, is

1. In a typewriting machine, the combination of a screw, it part into which it is threaded and from opposite sides whereof it projects, and means comprising a single device co-operating with the oppositely projecting portions of said screw to lock it in place and a securing device for holding said single device in looking engagement.

2. In a typewriting machine, the combination of a screw, a part into which it is threaded and from opposite sides whereof it proj ects, a locking plate engaging with said screw at opposite sides of said part and a device for applying locking pressure against said plate.

3. In a typewriting machine, the combination of a screw, a part into which it is threaded and from which it projects, a flanged locking plate embracing said part, and means for forcing the flanged portion of said plate against the projecting portion of said screw and maintaining said plate rigidly against said screw.

4. In a typewriting machine, the combination of a screw, a part into which it is threaded and from which its opposite end portions project, a flanged locking plate, the flanges being provided with inclined contact faces, and means for forcing said faces against the exposed threaded ends of said screw.

5. In a typewriting machine, the combination of a pivot screw, a part into which it is threaded and from which its opposite end portions project, a flanged locking plate cmbracing said part and contacting with the sides of the projecting portions of said screw, and a securing screw for securing said locking plate in place rigidly and applying pressure through it to said pivot screw.

6. In a typewriting machine, the combination of a screw, a part into which it is threaded and from which its end portions project oppositely, a locking plate contacting at opposite ends with said screw and with a fixed part, and a pressure applying screw co-operating with said plate between its ends, said screw being coned to co-operate with a beveled hole in said plate.

7. In a typewriting machine, the combination of a carriage, a feed rack, a feed pinion, a frame to which said feed rack is secured, oppositely projecting pivot screws on said frame, bearings on said carriage for said pivot screws, locking plates co-operative with said screws to apply pressure to them transversely of their axes, and securing screws for said locking plates, said securing screws hold-' ing said locking plates rigidly in place and transmitting pressure through said plates to said pivot screws to lock them on said frame.

8. In screw locking devices, the combination of a bar or support having an interiorly threaded lug, a pivot screw passing tl'irough said lug and extending on opposite sides thereof, a doubly flanged plate embracing said lug and bearing on said bar or support at one end and also bearing upon the projecting portions of the screw at the opposite end, and a fastening screw between the ends of said doulol flanged plate which enters said bar or support and clamps said plate thereto after its flanged portions have been properly set to engage the projecting threaded ends of the pivot screw.

9. The combination of a pivot, a support on which said pivot is mounted and from which it projects, a fulcrumed locking plate, and a screw for rocking said plate on its fulcrum and forcing and maintaining the plate rigid- 1y against an exposed position of said pivot transversely of its axis.

10. The combination of a screw, a part into which said screw is threaded and from the sides of which opposite end positions of the screw project, a locking plate fulcrumed at one end, and contactively engaging at the other end with said screw, and a pressure applying screw cooperating with said locking plate intermediate its ends for positively rocking the plate on its fulcrum and securing the plate rigidly against and locking the screw in place.

Signed at Ilion, in the county of Herkimer and State of New York, this 10th day of J 11116, A. D. 1925.

WILHELM A. SCHMIDT. 

